Form grinding apparatus



June 1, H. J. GRIFFING ET AL 2,082,734

FORM GRINDING APPARATUS- Filed June 26, 1936 5 Fl'g1 'IIIIIIIII HERBERTJE'R/FF/NE:

E'HRL E. F LYGHRE F1 g 4- 7' Patented June 1, 1937 UNITED STATES PA TENTOFFICE FORM GRINDING APPARATUS setts Application June 26, 1936, SerialNo. sasoc 6 Claims.

This invention relates to a grinding machine, and more particularly to aforming device for grinding a curved or irregular face on the peripheryof a work piece.

One object of this invention is to provide a simple and thoroughlypractical grinding machine for grinding the periphery of a work piece toan irregular contour as the work piece and grinding wheel arereciprocated longitudinally relative to each other. Another object ofthis invention is to provide a means to cause a transverse movement ofone or both ends of the work axis toward or from the grinding wheelduring a relative longitudinal reciprocation between the grinding wheeland work piece to grind an irregular shape on the periphery of a workpiece. A further object of the invention is to provide a pivotallymounted footstock and/or headstock, one or both of which may be rockedto move the work axis relatively toward and from the grinding wheel axisduring a relative longitudinal reciprocatory movement between the wheeland work to grind a predetermined contour or form on the periphery ofthe work piece. Other objects willbe in part obvious or in part pointedout hereinafter.

The invention accordingly consists in the features of construction,combinations of elements, and arrangements of parts, as will beexemplified in the structure to be hereinafter described, and the scopeof the application of which will be indicated in the following claims.

In the accompanying drawing in which is shown one of various possibleembodiments of the mechanical features of this invention,

Fig. 1 is a front elevation of a grinding machine embodying thisinvention;

Fig. 2 is a fragmentary end elevation of a tilting footstock, takenapproximately on the line 2--2 of Fig. 1;

Fig. 3 is a front elevation of the parts shown in Fig. 2;

Fig. 4 is a fragmentary sectional view, showing the adjustment of theroller, on an enlarged scale, and the parts shown in Fig. 2; and

Fig. 5 is a fragmentary sectional view, taken approximately on the line5-5 of Fig. 4, showing the clamping means for locking the eccentric studin adjusted position,

A grinding machine has been illustrated in the drawing, comprising abase l which supports a transversely movable grinding wheel slide Hwhich is adapted to slide transversely on a V- way and flat way (notshown) on the base ill. The wheel slide H supportsarotatable grindingwheel l2. The wheel slide H and grinding wheel l2 may be movedtransversely relative to the base it by means of a wheel feedingmechanism comprising a feed screw and half nut (not' shown) which may beactuated by means of a manually operable feed wheel IS. The parts of thefeed mechanism are not considered a part of the present invention andconsequently have not been illustrated in detail. These parts aresubstantially identical to those shown in the prior expired U. S. Patentto Norton No. 762,838 dated June 14, 1904, to which reference may be hadfor a more detailed disclosure.

The base It! also supports a longitudinally movable work supportingtable 20 which is arranged to be reciprocated longitudinally relative tothe base ill by means of a power operated table reciprocating mechanism,such as that shown in the prior patent to Norton No. 762,838. A tablereversing lever 2! is pivotally mounted on' the base and is arranged tobe actuated by adjustable dogs 22 and 23 which are adjustably mounted ina T-slot 24 on the front edge of the longitudinally movable table 20.The table 20 may, if desired, be traversed longitudinally by means of amanually operable hand wheel 26 which is connected through a reductiongear mechanism to a rack and gear beneath the table so that when thehand wheel 26 is rotated, the table 20 is moved longitudinally in eitherdirection, depending on the direction of rotation of the traverse wheel26.

If desired, the wheel I2 may be fed transversely by a manual rotation ofthe feed wheel 15 or, if desired, the feed wheel l may be actuatedautomatically at the ends of the reciprocatory stroke of the table 20.This is preferably accomplished by providing a connecting link 25 whichserves to rotate a crankpin 28 which is connected by a link 29 toreciprocate a vertical slide 30. The vertical slide 30 carries a feedpawl 3| which is arranged to engage ratchet teeth on the periphery ofthe feed wheel I5. These parts are all more fully disclosed in the priorpatent above mentioned.

The table Zll is provided with a rotatable work support comprising aheadstock Ml and a footstock ll which are provided with centers 42 and43 respectively and serve to rotatably support a work piece 64 inoperative relation with the grinding wheel l2. The headstock 40 may beof a belt driven or motor driven type, the latter type being illustratedas showing a motor driven headstock of the type shown in 'the priorUnited States Patent No. 1,631,458, in which an electric motor 45 ismounted on top of the headstock Ml. A motor pulley Mi is connected by abelt 41 with a pulley 48 mounted on the outer end of the work spindle.

In grinding certain work pieces, it is frequently necessary to grind awork piece which is cylindrical in shape throughout a greater part ofits length, but in which the end portions of the work piece are taperedor rounded ofi to a predetermined shape and form. In order to grind sucha shape on the work piece, it is desirable to provide a construction inwhich the parts are so arranged that the work piece may be movedtransversely toward or from the grinding wheel to grind a predeterminedshape thereon as the table 20 is reciprocated longitudinally. In thepreferred construction, the footstock 4| is arranged so that it may bemoved transversely and is preferably formed in two parts, an upper part4| which is pivotally mounted to a lower sition. This may comprisea'binding mechanism comprising a threaded bushing and a bushing 16 whichslides on a cylindrical portion of a. clamping screw 11. The screw 11 isscrew threaded into the bushing 15 and is provided with a hexagonallyshaped head 18. When the stud 6| has been adjusted to a predeterminedextent, a wrench may be applied to the head 18 to rotate the screw 11and to draw the bushings 15 and 16 toward each other to clamp the stud6| part 45 by means of a pivot pin or stud 46. The in its adjustedposition. 10 part 4| may be rocked so as to move the footstock It willbe readily apparent from the foregoing center 43 toward and from thewheel axis to disclosure that when the table is traversed longichangethe position of the work axis during the tudinally, the roller 51 servesas a backing roller 15 longitudinal reciprocating motion thereof. The tosupport the under side of the forming bar 55 15 lower part of thefootstock 45 is provided with and the upper roller 60 serves to transmitany a surface 41 which mates with a correspondingly motion formed in theforming bar 55 to rock the shaped surface on the table 2|] and isarranged to footstock 4| and thereby cause a transverse movebe clampedin adjusted position thereon by means ment of the footstock center 43toward and from 20 of a clamping block 48. the grinding wheel. Asillustrated, a major por- 20 A mechanism is provided for rocking thefoottion of the bar 55 is provided with opposed parstock 4| as the table20 is reciprocated longiallel sides 80 and 8| which transmit no relativetudinally so as to produce a predetermined face motion to the footstockand consequently grind on the periphery of the work piece. In the preacylindrical surface on the work piece. A curved ferred construction, aforming bar 55 is fastened portion 82 on the bar serves, when the table20 25 at one end to a bracket 55 which is supported on moves toward theright, to cause a transverse the base It. The bar 55 engagesa rotatableroller rocking movement of the footstock ll as it 51 which is carried bya stud 58 supported at reaches the end of its stroke so as to cause theone end by a bracket 59 and at the other end in footstock end of thework axis to approach the th lower part 45 of th footstock 4|, A r ttgrinding wheel axis at a controlled rate and to 30 able roller ,60 issupported on a stud 5|, one end e y p uce a curved Surface 33 On t Workof which is carried by a bracket 62 and the other Pi e y S p g the $0 apredetermined end of which is supported in the footstock 4|. shape, anyf m ay be p d n t roll or The upper pivotally mounted portion 4| is heldCy ndr a Wor p e e e g dy a 35 by a yieldable means so that the roller60 is maing t eccentric the footstock center may be 35 tained inoperative contact with the upper suroffset relative to the path oftravel of the table face of the forming bar 55, while the under sursothat a taper will be ground on the periphery of face of the bar rests onthe rotatable roller 51. the work piece and as the work piece pp s A rod65 is pivotally connected to the lower part e en of its Stroke. a Curveda 33 Will be p of the footstock by means of a stud G6. The duced on theend of the tapered surface. 0

rod passes through a clearance hole 61 in the footstock 4|. A thrust I=i. 0'

headstock or the footstock or both of them may be arranged for a rockingmotion to shift the work axis during grinding to produce apredeterminedshape on the periphery of the work piece, as desired.

I'he operation of this mechanism is readily apparent from the foregoingdisclosure. The work piece 44 is mounted on the headstock center 42 andthe footstock center 43 and is rotated in the usual manner by means of adriving pin or dog (not shown) which is well known in the art.

Assuming the rollers 60 and 94 have been previously adjusted to positionthe headstock center 42 and the footstock center 43 in the desiredposition for grinding, the table is then reciprocated either by power ormanually traversed by means of the manually operable traverse wheel 26.

As the table moves longitudinally, the rollers 51 and 60, and 93 and 94,follow the surface of the bars 55 and 9| respectively to rock thefootstock 4| and the headstock 40, as desired, to grind a predeterminedirregularly shaped face on the periphery of the work piece 44. Thegrinding wheel l2 may be fed automatically at the ends of the tablestroke, as above described, or it may be advanced manually by rotationof the feed wheel l5 as desired. It will thus be seen that there hasbeen provided by this invention apparatus in which the various objectshereinabove set forth together with many thoroughly practical advantagesare successfully achieved. As many possible embodiments may be made ofthe above invention and as many changes might be made in the embodimentabove set forth, it is to be understood that all matter hereinbefore setforth or shown in the accompanying drawing is to be interpreted asillustrative and not in a limiting sense.

We claim:

1. In a grinding machine, a base, a rotatable grinding wheel, atransversely movable wheel slide on said base, a longitudinally movablework table, means to feed said slide transversely, means to reciprocatesaid table longitudinally, a rotatable work support thereon including aheadstock and a footstock, a work supporting center on the headstock andfootstock to rotatably support the opposite ends of a work piece, alongitudinally extending pivot for said footstock, and meansindependently to rock said footstock-transversely during thelongitudinal movement of said table to cause a transverse movement ofsaid footstock center during the grinding operation.

2. In a grinding machine, a base, a rotatable grinding wheel, atransversely movable wheel slide on said base, means to feed said slidetransversely, a longitudinally movable work table, means to reciprocatesaid table longitudinally, a rotatable work support thereon including aheadstock and a footstock each of which is provided with a worksupporting center, a longitudinally arranged pivotally mounted supportfor said footstock, a forming bar supported on said base, and a followeron said footstock which engages the form- 65 ing bar and servesindependently to rock the footstock transversely when the table istraversed longitudinally to produce a transverse approaching andreceding movement of said footstock center relative to the grindingwheel axis during the longitudinal movement between the wheel and worksupport.

3. In a grinding machine, a. base, a rotatable grinding wheel, atransversely movable wheel slide on said base, means to feed said slidetransversely, a longitudinally movable work table, means to reciprocatesaid table longitudinally, a rotatable work support thereon including aheadstock and a footstock each of which is provided with a worksupporting center, an independent longitudinally arranged pivotallymounted support for said headstock, a forming bar supported on saidbase, and a follower on said headstock which engages the forming bar andserves independently to rock the headstock transversely when the tableis traversed longitudinally to produce a transverse approaching andreceding movement of said headstock center relative to the grindingwheel axis during the longitudinal movement between the wheel and worksupport.

4. In a grinding machine, a base, a rotatable grinding wheel, atransversely movable slide on said base to support said wheel, alongitudinally movabletable, means to feed said slide transverselytoward and from said table to produce a grinding action, means toreciprocate said table longitudinally, a rotatable work support thereonincluding a headstock and a footstock each having a work supportingcenter which are arranged to rotatably support opposite ends of a workpiece, an independent longitudinally arranged pivotal support for eitherthe headstock or the footstock, and means to rock the pivotally mountedmember during the longitudinal movement of said table to produce anindependent transverse movement of one end of said work toward and fromthe axis of the grinding wheel during the grinding operation.

5. In a grinding machine, a base, a rotatable grinding wheel, atransversely movable wheel slide therefor supported on said base, alongitudinally movable table, means to feed said slide transverselytoward or from said table, means to reciprocate said tablelongitudinally, a rotatable work support thereon including a headstockand a footstock each having a work center which are arranged torotatably support the opposite ends of a work piece, apivotal supportbetween the headstock and the table, a pivotal support between thefootstock and said table, and means to independently rock said headstockand said footstock during the longitudinal movement of said table toproduce a transverse movement of said-work centers during the grindingoperation.

6. In a grinding machine, a-base, a rotatable grinding wheel, atransversely movable wheel slide therefor supported on said base, alongitudinally movable table, means to feed said slide transverselytoward or from said table, means to reciprocate saidtablelongitudinally, a rotatable work support thereon including aheadstock and a footstock each having a workcenter which are arranged torotatably support the opposite ends of a work piece, a pivotal supportbetween the headstock and the table, a pivotal support between thefootstock and said table, and means including a forming bar adjacent toeach end of said base and arranged to independently rock said headstockand said footstock during the longitudinal movement of said table toproduce a transverse movement of said work centers during the grindingoperation.

HERBERT J. GRIFFING. CARL G. FLYGARE.

